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Showing results for tags 'mesozoic'.
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Found these on vacation in Virginia. Are they the same type of ray despite the different look ?
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Here's a specimen bought at the gem show back in the days when Moroccan vertebrate stuff was starting to appear at Tucson and other shows. It's from the Kem Kem Beds (Cenomanian), Taouz area, Morocco like that other crocodile-like tooth I showed here several days ago.. This one is just under 2 3/8 inches (59mm) long with long folds/ridges of what appears to be enamel along its length so I think it's a tooth. Some of the folds end part of the way to the tip. There are spots where these folds are chipped revealing a rather smooth layer. It shows wear at the tip. I think it's some kind of crocodile though it seems rather slender for that and I would expect it to be more hollow (view at the root end provided). I'm wondering it actually belongs to some large fish. Maybe it's an odd spine. @Troodon, @LordTrilobite
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Here's a tooth I bought at the gem show back in the days when Moroccan vertebrate stuff was starting to appear at Tucson and other shows. I've been meaning to show it to people for years. It's from the Kem Kem Beds (Cenomanian), Taouz area, Morocco. It's about 61mm long with cutting edges that appear to be slightly crenulated rather than finely-serrated. It's oval in cross-section on the root end but the crown becomes blade-like toward the tip so it is somewhat labiolingually compressed. I assume it's a crocodile tooth but thought it might have a small chance at being from a dinosaur. I'll hit up the "Kem Kem regulars" for comment but am interested what others say as well. @Troodon @Haravex @LordTrilobite Thanks, Jess
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- archosaur
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Dug into this park on Tuesday for a few hours. I really have no experience with Mesozoic strata, aside from Coon Creek of Tennesse. The water was inconsistent in it's depth due to a local beaver dam causing higher than normal water levels. Material here consists of unconsolidated clays, gravel and sand. Here are two large bivalves I recovered from the upper beds containing clams. I believe these are Exogyra costata which are common at this location. This tooth belongs to Scapanorhynchus texanus in which the teeth are referred to as belonging to goblin sharks. This is untrue, as this taxa is distantly related to modern goblins but I believe they are within the same family? This is a pair of small bivalves, species possibly being miniscule Gryphaeostrea vomer? A single Agerostrea mesenterica. Finally pictured below, an unknown, based on corrected advice it is a worn Pycnodonte. This trip was long, but the report ended up being brief due to the difficulty I had getting into the productive zones at this site. In which happened to be straight down, through the toughest clay I have ever seen. I did however end up meeting one of the park volunteers named Doug, who was more than helpful, he frequents the area and is very friendly.
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- clams
- cretaceous
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From the album: Triassic
From the "dawn" of the Dinosaurs, this small tooth represents an early theropod. Unlike the other serrated archosauriform teeth present in the formation, this tooth is ziphodont - thin and labio-lingually compresed - the archetypical tooth form that most theropods adhered to since their beginnings.-
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- bull canyon
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From the album: Triassic
Lungfish are an ancient group of fish, with swim bladders that evolution co-opted as a kind of "lung," allowing them to breathe air. This may have proven invaluable in a seasonally dry climate in Pangea.-
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- bull canyon
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Is the fossil site at Union Wash worth going to? I've read that the site's been depleted of fossils. Is that true?
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This thread was inspired by Sander's excellent review of his collection of Squalicorax teeth. I have started getting some of my Squalicorax specimens together and a few have been photographed already to provide additional visual references for collectors. I will try to show teeth chronologically (Albian teeth first, then Cenomanian...) from early in the evolution of the genus and on to the time of its last representatives. I start with the two oldest Squalicorax teeth in my collection - a pair of specimens from the Upper Albian-age Pawpaw Formation, Motorola site, Tarrant County, Texas. The first tooth is S. pawpawensis (10mm along the mesial edge) and the second is S. priscoserratus (just over 10mm along the mesial edge).
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- anacoracid
- anacoracidae
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Was Given a Fossil Vertebrae and would like to get a Possible Idea of the Family
jws51203 posted a topic in Fossil ID
I was given a fossil vertebrae today and wasn’t given too much info on the origins. All I know is that it was collected in 1919, it’s not fully cleaned, and it’s from western US. It’s around 2 1/2x4x3 1/2 inches but the shape of the front being so weird makes me think that this isn’t the full vertebrae ( either from poor excavation or something having to do with the perseveration of the bone).
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This stone was found 40 years ago in the Santa Fe National Forest in New Mexico. I am trying to date the fossils. I guess it is Cretaceous but I am a newbie.
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Hello! I am student of the biological sciences with an intended minor in geology. I have been collecting fossils for a long time, and am excited to join the forum! I just purchased my first "dinosaur" specimen from an annual fossil show. My collection and interest has always been in Paleozoic invertebrates, so my dinosaur knowledge is extremely limited. The seller said the species was of the Dromaeosaurus genus and the origin was from the well known Hell Creek formation, however I took everything he said with a grain of salt. After reading some previous posts on the forum i've seen that it may be from morocco, and henceforth not part of the Dromaeosaurus genus. The length of the tooth is exactly 1/2 an inch in length. I've included some photos below of the exact condition in which it was sold to me. I know identification from a single tooth can be difficult, so I'm grateful for any information that can be provided on the specimen! Please let me know if more adequate photos need to be provided, I have several microscopes in my collection that could get a closer view of the serrations.
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发现于马达加斯加。 无法确定具体的产地。 它可能来自 Maevarano 组。 是脊椎吗？还是股骨？ 感谢您的回答！
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@pachy-pleuro-whatnot-odon and I wrote a paper on Mosasaurus hoffmannii fossils from the Moroccan Phosphates. https://www.researchgate.net/publication/357836567_Occurrence_of_Mosasaurus_hoffmannii_Mantell_1829_Squamata_Mosasauridae_in_the_Maastrichtian_Phosphates_of_Morocco https://www.aaps-journal.org/pdf/JPS.C.22.0001.pdf Abstract: Marginal tooth crowns from the hypercarnivorous marine reptile Mosasaurus hoffmannii Mantell, 1829 are reported for the first time from the Late Cretaceous (Maastrichtian) phosphates of Morocco. Fossilized remains of this species are previously known from Campanian and Maastrichtian outcrops in Europe, North America, and western Asia at a paleolatitudinal belt of 30-45°N. New fossil material originates from the Upper Couche III layer of the Oulad Abdoun Basin, south of Oued Zem, Morocco. The discovery of M. hoffmannii in Morocco extends its paleobiogeographic range south to 25°N and into the southern margin of the Mediterranean Tethys. Rempert, T.H., Vinkeles Melchers, A.P.M., Rempert, A.N., Haque, M.R., and Armstrong, A.R. (2022). Occurrence of Mosasaurus hoffmannii Mantell, 1829 (Squamata, Mosasauridae) in the Maastrichtian Phosphates of Morocco. The Journal of Paleontological Sciences, 10: 1-22. It has been fun working on this project. Great to finally see it published. Many thanks to the Editorial Board of the Journal of Paleontological Sciences and Walter Stein and Dr. John Nudds for helpful review. Excavation zone in the Sidi Chennane phosphate quarry. Lithostratigraphical units of the Sidi Chennane Phosphate Quarry; mosasaurid remains originate from the Upper Couche III layer. Mosasaurus hoffmannii Mantell, 1829, from the Moroccan phosphates. A. REMPC M0001, UCIII (Maastrichtian) layer, Oulad Abdoun Basin, Sidi Daoui, in posterior (A1), labial (A2), anterior (A3), and lingual (A4) view. B. REMPC M0002, UCIII (Maastrichtian) layer, Oulad Abdoun Basin, Sidi Chennane, in posterior (B1), labial (B2), anterior (B3), and lingual (B4) view. C. REMPC M0003, UCIII (Maastrichtian) layer, Oulad Abdoun Basin, Sidi Chennane, in posterior (C1), labial (C2), anterior (C3), and lingual (C4) view. Mosasaurus hoffmannii Mantell, 1829, from the Moroccan phosphates. D. AVM 01, UCIII (Maastrichtian) layer, Oulad Abdoun Basin, in posterior (D1), labial (D2), anterior (D3), and lingual (D4) view. Upper Couche III (Maastrichtian) layer, Oulad Abdoun Basin, Morocco. E. AVM 02, UCIII (Maastrichtian) layer, Oulad Abdoun Basin, in posterior (E1), labial (E2), anterior (E3), and lingual (E4) view. Mosasaurus hoffmannii Mantell, 1829, F. CORN 01 in anterior (F1), labial (F2), posterior (F3), and lingual (F4) view. Upper Couche III (Maastrichtian) layer, Oulad Abdoun Basin, Morocco (Image courtesy of George Corneille). Teeth from the first discovered Mosasaurus hoffmannii specimen, TM 7424, Teylers Museum, Haarlem, the Netherlands, A. in lingual view; B. in labial view showing prism faces; C. in lingual view showing indiscernible lingual facets, light serrations on the carinae, and medial tooth curvature.
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From the album: Prae's Mosasaurs
Carinodens belgicus tooth.-
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- cretaceous
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From the album: Prae's Mosasaurs
Carinodens belgicus - The corn-kernel toothed mosasaur.-
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- carinodens
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I purchased these as Ingenia yanshini which I think became Ajancingenia, which then became and is currently Heyuannia. The formation provided is the Djadochta Formation, but that doesn't seem right since Ingenia/Heyuannia is not found there as far as I've checked. Unfortunately, there isn't provenance other than Mongolia attached to them to say whether they come from the Barun Goyot Formation where Heyuannia yanshini is found. While I'm not necessarily doubting the original ID, I just don't really know. I'm not expecting a positive or diagnostic ID to the genus level, but I wanted to at least know whether or not I can label this to Oviraptoridae indet., possibly Heyuanniinae indet. The original ID is a bit of an odd one, but it might have just been one of the few oviraptorids described at the time. Last I checked, there are now tons of recently described oviraptorid genera in Mongolia and China. The pair of phalanges with supposedly the semilunate carpal attached which I think is the smaller section? I know one of them did have glue in-between them when I lightly smeared it with acetone using a cotton swab. They are associated coming from the same sandstone block, apparently along with other shattered phalanges. Although I don't know if these actually came from the same animal since one looks ever so slightly larger. There is some sort of clump of sand or crystalized piece attached, as well as light beige or cream colored matrix. Not sure if that narrows down a formation, probably not, but I do see a lot of matrix from Mongolia tend to be red-ish color similar to the Kem Kem Beds. Any input is appreciated. There's probably a lesson to be learned here . . .
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Hi all, I visited Aust Cliff in South Gloucestershire, UK for a couple of hours last week. I wasn't expecting much as I know how heavily collected it is, but got a few bits of interest which I was happy with under the circumstances. I'd be interested in educated takes on a couple of bits of bone bed I found there at least, especially this first piece that contains what I believe to be multiple bone fragments as well as coprolite pieces and lots of small black fragments - not sure if scales, teeth or what. Here's a view showing what I imagine is one end of a reptile limb bone - could this be Pachystropheus? And on the other side are a couple of embedded chunks that have the honeycomb texture of bone but without the outer coating (not sure of the technical terms here!) No chance of identifying such things I presume, beyond 'yes it's bone'?
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Greetings good people of the fossil forum... I stand before you all this afternoon to let you know of an event happening at the Tate Geological Museum in Casper, Wyoming on June 4-6. Yes, it is the 26th annual Tate Conference! The theme this year is Marine Reptiles. We have speakers from all over the map (including a few virtual folks speaking form Europe), talking about mosasaurs, ichthyosaurs, plesiosaurs, sea turtles and even Tanystropheus (one of my personal favorites). Talks will be here on the Casper College campus and will be all day on Friday the 4th. As usual, we are having two days of field trips as well with the conference. Saturday we will head out to the Cretaceous Pierre Shale in eastern Wyoming for mosasaurs (and fishes) and with some luck, a plesiosaur. With a ton o f luck we turn up a sea turtles or pterosaur or bird. On Sunday we will go into the Jurassic Sundance Formation to look for ichthyosaurs (and the ever-present belemnites) and maybe an plesiosaur. Friday conference attendees get priority for spaces on the field trips. Registration and a list of speakers and talks can be found here: https://www.caspercollege.edu/tate-geological-museum/events/conference/ I would love to see a few folks form the forum show up. Casper College has done away with mask ordinances, but we will be encouraging masks and social distancing. Masks are still required for the field trips... the automotive portion.
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I thought I would ask here, do any of the members here have Mesozoic gar fossils in their collection, im not looking to buy them, more wanting to see the range of Mesozoic fossil gar material owned by members here
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Hello everyone, Some time ago I was talking about a gastropod fossil with an individual online who thought that it was an ammonite, During this conversation one thing was brought up that I have wondered about for a long time but have not actually been able to answer, and that is what exactly do we consider an ammonite? I have always thought that ammonites are the cephalopods with an external shell containing complex sutures which occur throughout the Mesozoic, but people have pointed out that certain sites talk about ammonites going back to the Devonian. I have always thought that those were ammonoids but not necessarily ammonites, I don't know how I decided that this was the case and now I realize that this might be wrong. Does anyone know if those Paleozoic ammonoids are actually considered ammonites? What exactly is an ammonite and when do they appear? I would be very interested to hear what you guys have to say, any input is appreciated. Thank you!
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Hi all, I recently became aware that Madagascar appears to have a fully developed and interesting Mesozoic marine reptile record, yet am not particularly able to find any information on them. The only article I have come across is Bardet and Termier, 1990, "Première description de restes de Plésiosaure provenant de Madagascar (gisement de Berere, Campanien)". However, I've been unable to track this article down. As such, I was wondering whether anybody on TFF might have any information on them. Basically, I'm starting from scratch, so would be very interested in the clades of marine reptile that are known from the region, if not recognized genera or even species. What formations have remains been found in, to what stages in earth geological history do these date, and where geographically are these located? Ideally, there'd be some open-access articles I could refer to, yet any bit of information is welcome. Thanks in advance!
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Heya! These are a couple of brachiopods I have found in the Cotswolds, UK. They are from the Middle Jurassic, and were found encased in oolitic limestone. They are a triangular shape, and, on the first picture, you can see remnants of a hinge. The third picture shows two of these valves. I haven't done any prep on them yet, as I am unaware of their exact shape, and do not want to risk damage to the actual fossil, so there is visible amounts of matrix. If anyone could put me on the right tracks of identification, or perhaps give me a rough ID, I would be very grateful!
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Premaxillary tooth EDIT: Changed from Tyrannosaurus rex to Tyrannosaurid indet.
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- carter county
- cretaceous
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Dimensions: CH = 41 mm CWB = 10 mm CBL = 16 mm MC = 18 denticles/5 mm DC = 14 denticles/5 mm DSDI = 1.29
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Hi from Washington state! I was wanting to talk to people about paleontology and then realized that were probably many paleo forums. Guess I'm here now haha. I tend to focus on Mesozoic life but sometimes I go off the deep end and spend a few weeks obsessed with the Paleozoic or Cenozoic. I have some fossils but no vertebrate fossils yet: I have a chunk and a log of petrified wood, a snail shell, a leaf, and some shark parts. Looking forward to going on some hunts one day but WA is more for mammal fossils. I'm looking to go into paleontology at the University of Washington and I'm excited to finally be at school for my passion. Looking forward to geeking out over bones with you!
